名词
中文翻译：邮政证明书
同义词：
['certificate of postage', 'postal certificate']
例句：
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1.He received the postage certificate from the post office.
他从邮局收到了邮资证明。
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2. The postal certificate was issued to him by the government.
政府给他颁发了邮政证书。
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3. The postage certificate is required for international mail.
国际邮件需要邮资证明。